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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / udp.c
1 /*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <asm/uaccess.h>
38
39 #include <net/ndisc.h>
40 #include <net/protocol.h>
41 #include <net/transp_v6.h>
42 #include <net/ip6_route.h>
43 #include <net/raw.h>
44 #include <net/tcp_states.h>
45 #include <net/ip6_checksum.h>
46 #include <net/xfrm.h>
47
48 #include <linux/proc_fs.h>
49 #include <linux/seq_file.h>
50 #include "udp_impl.h"
51
52 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
53 {
54 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
55 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
56 __be32 sk1_rcv_saddr = inet_sk(sk)->inet_rcv_saddr;
57 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
58 int sk_ipv6only = ipv6_only_sock(sk);
59 int sk2_ipv6only = inet_v6_ipv6only(sk2);
60 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
61 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
62
63 /* if both are mapped, treat as IPv4 */
64 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
65 return (!sk2_ipv6only &&
66 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
67 sk1_rcv_saddr == sk2_rcv_saddr));
68
69 if (addr_type2 == IPV6_ADDR_ANY &&
70 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
71 return 1;
72
73 if (addr_type == IPV6_ADDR_ANY &&
74 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
75 return 1;
76
77 if (sk2_rcv_saddr6 &&
78 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
79 return 1;
80
81 return 0;
82 }
83
84 static unsigned int udp6_portaddr_hash(struct net *net,
85 const struct in6_addr *addr6,
86 unsigned int port)
87 {
88 unsigned int hash, mix = net_hash_mix(net);
89
90 if (ipv6_addr_any(addr6))
91 hash = jhash_1word(0, mix);
92 else if (ipv6_addr_v4mapped(addr6))
93 hash = jhash_1word(addr6->s6_addr32[3], mix);
94 else
95 hash = jhash2(addr6->s6_addr32, 4, mix);
96
97 return hash ^ port;
98 }
99
100
101 int udp_v6_get_port(struct sock *sk, unsigned short snum)
102 {
103 unsigned int hash2_nulladdr =
104 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
105 unsigned int hash2_partial =
106 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
107
108 /* precompute partial secondary hash */
109 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
110 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
111 }
112
113 static inline int compute_score(struct sock *sk, struct net *net,
114 unsigned short hnum,
115 struct in6_addr *saddr, __be16 sport,
116 struct in6_addr *daddr, __be16 dport,
117 int dif)
118 {
119 int score = -1;
120
121 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
122 sk->sk_family == PF_INET6) {
123 struct ipv6_pinfo *np = inet6_sk(sk);
124 struct inet_sock *inet = inet_sk(sk);
125
126 score = 0;
127 if (inet->inet_dport) {
128 if (inet->inet_dport != sport)
129 return -1;
130 score++;
131 }
132 if (!ipv6_addr_any(&np->rcv_saddr)) {
133 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
134 return -1;
135 score++;
136 }
137 if (!ipv6_addr_any(&np->daddr)) {
138 if (!ipv6_addr_equal(&np->daddr, saddr))
139 return -1;
140 score++;
141 }
142 if (sk->sk_bound_dev_if) {
143 if (sk->sk_bound_dev_if != dif)
144 return -1;
145 score++;
146 }
147 }
148 return score;
149 }
150
151 #define SCORE2_MAX (1 + 1 + 1)
152 static inline int compute_score2(struct sock *sk, struct net *net,
153 const struct in6_addr *saddr, __be16 sport,
154 const struct in6_addr *daddr, unsigned short hnum,
155 int dif)
156 {
157 int score = -1;
158
159 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
160 sk->sk_family == PF_INET6) {
161 struct ipv6_pinfo *np = inet6_sk(sk);
162 struct inet_sock *inet = inet_sk(sk);
163
164 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
165 return -1;
166 score = 0;
167 if (inet->inet_dport) {
168 if (inet->inet_dport != sport)
169 return -1;
170 score++;
171 }
172 if (!ipv6_addr_any(&np->daddr)) {
173 if (!ipv6_addr_equal(&np->daddr, saddr))
174 return -1;
175 score++;
176 }
177 if (sk->sk_bound_dev_if) {
178 if (sk->sk_bound_dev_if != dif)
179 return -1;
180 score++;
181 }
182 }
183 return score;
184 }
185
186
187 /* called with read_rcu_lock() */
188 static struct sock *udp6_lib_lookup2(struct net *net,
189 const struct in6_addr *saddr, __be16 sport,
190 const struct in6_addr *daddr, unsigned int hnum, int dif,
191 struct udp_hslot *hslot2, unsigned int slot2)
192 {
193 struct sock *sk, *result;
194 struct hlist_nulls_node *node;
195 int score, badness;
196
197 begin:
198 result = NULL;
199 badness = -1;
200 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
201 score = compute_score2(sk, net, saddr, sport,
202 daddr, hnum, dif);
203 if (score > badness) {
204 result = sk;
205 badness = score;
206 if (score == SCORE2_MAX)
207 goto exact_match;
208 }
209 }
210 /*
211 * if the nulls value we got at the end of this lookup is
212 * not the expected one, we must restart lookup.
213 * We probably met an item that was moved to another chain.
214 */
215 if (get_nulls_value(node) != slot2)
216 goto begin;
217
218 if (result) {
219 exact_match:
220 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
221 result = NULL;
222 else if (unlikely(compute_score2(result, net, saddr, sport,
223 daddr, hnum, dif) < badness)) {
224 sock_put(result);
225 goto begin;
226 }
227 }
228 return result;
229 }
230
231 static struct sock *__udp6_lib_lookup(struct net *net,
232 struct in6_addr *saddr, __be16 sport,
233 struct in6_addr *daddr, __be16 dport,
234 int dif, struct udp_table *udptable)
235 {
236 struct sock *sk, *result;
237 struct hlist_nulls_node *node;
238 unsigned short hnum = ntohs(dport);
239 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
240 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
241 int score, badness;
242
243 rcu_read_lock();
244 if (hslot->count > 10) {
245 hash2 = udp6_portaddr_hash(net, daddr, hnum);
246 slot2 = hash2 & udptable->mask;
247 hslot2 = &udptable->hash2[slot2];
248 if (hslot->count < hslot2->count)
249 goto begin;
250
251 result = udp6_lib_lookup2(net, saddr, sport,
252 daddr, hnum, dif,
253 hslot2, slot2);
254 if (!result) {
255 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
256 slot2 = hash2 & udptable->mask;
257 hslot2 = &udptable->hash2[slot2];
258 if (hslot->count < hslot2->count)
259 goto begin;
260
261 result = udp6_lib_lookup2(net, &in6addr_any, sport,
262 daddr, hnum, dif,
263 hslot2, slot2);
264 }
265 rcu_read_unlock();
266 return result;
267 }
268 begin:
269 result = NULL;
270 badness = -1;
271 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
272 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
273 if (score > badness) {
274 result = sk;
275 badness = score;
276 }
277 }
278 /*
279 * if the nulls value we got at the end of this lookup is
280 * not the expected one, we must restart lookup.
281 * We probably met an item that was moved to another chain.
282 */
283 if (get_nulls_value(node) != slot)
284 goto begin;
285
286 if (result) {
287 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
288 result = NULL;
289 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
290 daddr, dport, dif) < badness)) {
291 sock_put(result);
292 goto begin;
293 }
294 }
295 rcu_read_unlock();
296 return result;
297 }
298
299 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
300 __be16 sport, __be16 dport,
301 struct udp_table *udptable)
302 {
303 struct sock *sk;
304 struct ipv6hdr *iph = ipv6_hdr(skb);
305
306 if (unlikely(sk = skb_steal_sock(skb)))
307 return sk;
308 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
309 &iph->daddr, dport, inet6_iif(skb),
310 udptable);
311 }
312
313 /*
314 * This should be easy, if there is something there we
315 * return it, otherwise we block.
316 */
317
318 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
319 struct msghdr *msg, size_t len,
320 int noblock, int flags, int *addr_len)
321 {
322 struct ipv6_pinfo *np = inet6_sk(sk);
323 struct inet_sock *inet = inet_sk(sk);
324 struct sk_buff *skb;
325 unsigned int ulen;
326 int peeked;
327 int err;
328 int is_udplite = IS_UDPLITE(sk);
329 int is_udp4;
330
331 if (addr_len)
332 *addr_len=sizeof(struct sockaddr_in6);
333
334 if (flags & MSG_ERRQUEUE)
335 return ipv6_recv_error(sk, msg, len);
336
337 try_again:
338 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
339 &peeked, &err);
340 if (!skb)
341 goto out;
342
343 ulen = skb->len - sizeof(struct udphdr);
344 if (len > ulen)
345 len = ulen;
346 else if (len < ulen)
347 msg->msg_flags |= MSG_TRUNC;
348
349 is_udp4 = (skb->protocol == htons(ETH_P_IP));
350
351 /*
352 * If checksum is needed at all, try to do it while copying the
353 * data. If the data is truncated, or if we only want a partial
354 * coverage checksum (UDP-Lite), do it before the copy.
355 */
356
357 if (len < ulen || UDP_SKB_CB(skb)->partial_cov) {
358 if (udp_lib_checksum_complete(skb))
359 goto csum_copy_err;
360 }
361
362 if (skb_csum_unnecessary(skb))
363 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
364 msg->msg_iov,len);
365 else {
366 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
367 if (err == -EINVAL)
368 goto csum_copy_err;
369 }
370 if (err)
371 goto out_free;
372
373 if (!peeked) {
374 if (is_udp4)
375 UDP_INC_STATS_USER(sock_net(sk),
376 UDP_MIB_INDATAGRAMS, is_udplite);
377 else
378 UDP6_INC_STATS_USER(sock_net(sk),
379 UDP_MIB_INDATAGRAMS, is_udplite);
380 }
381
382 sock_recv_ts_and_drops(msg, sk, skb);
383
384 /* Copy the address. */
385 if (msg->msg_name) {
386 struct sockaddr_in6 *sin6;
387
388 sin6 = (struct sockaddr_in6 *) msg->msg_name;
389 sin6->sin6_family = AF_INET6;
390 sin6->sin6_port = udp_hdr(skb)->source;
391 sin6->sin6_flowinfo = 0;
392 sin6->sin6_scope_id = 0;
393
394 if (is_udp4)
395 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
396 &sin6->sin6_addr);
397 else {
398 ipv6_addr_copy(&sin6->sin6_addr,
399 &ipv6_hdr(skb)->saddr);
400 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
401 sin6->sin6_scope_id = IP6CB(skb)->iif;
402 }
403
404 }
405 if (is_udp4) {
406 if (inet->cmsg_flags)
407 ip_cmsg_recv(msg, skb);
408 } else {
409 if (np->rxopt.all)
410 datagram_recv_ctl(sk, msg, skb);
411 }
412
413 err = len;
414 if (flags & MSG_TRUNC)
415 err = ulen;
416
417 out_free:
418 skb_free_datagram_locked(sk, skb);
419 out:
420 return err;
421
422 csum_copy_err:
423 lock_sock(sk);
424 if (!skb_kill_datagram(sk, skb, flags)) {
425 if (is_udp4)
426 UDP_INC_STATS_USER(sock_net(sk),
427 UDP_MIB_INERRORS, is_udplite);
428 else
429 UDP6_INC_STATS_USER(sock_net(sk),
430 UDP_MIB_INERRORS, is_udplite);
431 }
432 release_sock(sk);
433
434 if (flags & MSG_DONTWAIT)
435 return -EAGAIN;
436 goto try_again;
437 }
438
439 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
440 u8 type, u8 code, int offset, __be32 info,
441 struct udp_table *udptable)
442 {
443 struct ipv6_pinfo *np;
444 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
445 struct in6_addr *saddr = &hdr->saddr;
446 struct in6_addr *daddr = &hdr->daddr;
447 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
448 struct sock *sk;
449 int err;
450
451 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
452 saddr, uh->source, inet6_iif(skb), udptable);
453 if (sk == NULL)
454 return;
455
456 np = inet6_sk(sk);
457
458 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
459 goto out;
460
461 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
462 goto out;
463
464 if (np->recverr)
465 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
466
467 sk->sk_err = err;
468 sk->sk_error_report(sk);
469 out:
470 sock_put(sk);
471 }
472
473 static __inline__ void udpv6_err(struct sk_buff *skb,
474 struct inet6_skb_parm *opt, u8 type,
475 u8 code, int offset, __be32 info )
476 {
477 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
478 }
479
480 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
481 {
482 struct udp_sock *up = udp_sk(sk);
483 int rc;
484 int is_udplite = IS_UDPLITE(sk);
485
486 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
487 goto drop;
488
489 /*
490 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
491 */
492 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
493
494 if (up->pcrlen == 0) { /* full coverage was set */
495 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
496 " %d while full coverage %d requested\n",
497 UDP_SKB_CB(skb)->cscov, skb->len);
498 goto drop;
499 }
500 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
501 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
502 "too small, need min %d\n",
503 UDP_SKB_CB(skb)->cscov, up->pcrlen);
504 goto drop;
505 }
506 }
507
508 if (sk->sk_filter) {
509 if (udp_lib_checksum_complete(skb))
510 goto drop;
511 }
512
513 if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) {
514 /* Note that an ENOMEM error is charged twice */
515 if (rc == -ENOMEM)
516 UDP6_INC_STATS_BH(sock_net(sk),
517 UDP_MIB_RCVBUFERRORS, is_udplite);
518 goto drop_no_sk_drops_inc;
519 }
520
521 return 0;
522 drop:
523 atomic_inc(&sk->sk_drops);
524 drop_no_sk_drops_inc:
525 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
526 kfree_skb(skb);
527 return -1;
528 }
529
530 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
531 __be16 loc_port, struct in6_addr *loc_addr,
532 __be16 rmt_port, struct in6_addr *rmt_addr,
533 int dif)
534 {
535 struct hlist_nulls_node *node;
536 struct sock *s = sk;
537 unsigned short num = ntohs(loc_port);
538
539 sk_nulls_for_each_from(s, node) {
540 struct inet_sock *inet = inet_sk(s);
541
542 if (!net_eq(sock_net(s), net))
543 continue;
544
545 if (udp_sk(s)->udp_port_hash == num &&
546 s->sk_family == PF_INET6) {
547 struct ipv6_pinfo *np = inet6_sk(s);
548 if (inet->inet_dport) {
549 if (inet->inet_dport != rmt_port)
550 continue;
551 }
552 if (!ipv6_addr_any(&np->daddr) &&
553 !ipv6_addr_equal(&np->daddr, rmt_addr))
554 continue;
555
556 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
557 continue;
558
559 if (!ipv6_addr_any(&np->rcv_saddr)) {
560 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
561 continue;
562 }
563 if (!inet6_mc_check(s, loc_addr, rmt_addr))
564 continue;
565 return s;
566 }
567 }
568 return NULL;
569 }
570
571 static void flush_stack(struct sock **stack, unsigned int count,
572 struct sk_buff *skb, unsigned int final)
573 {
574 unsigned int i;
575 struct sock *sk;
576 struct sk_buff *skb1;
577
578 for (i = 0; i < count; i++) {
579 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
580
581 sk = stack[i];
582 if (skb1) {
583 bh_lock_sock(sk);
584 if (!sock_owned_by_user(sk))
585 udpv6_queue_rcv_skb(sk, skb1);
586 else
587 sk_add_backlog(sk, skb1);
588 bh_unlock_sock(sk);
589 } else {
590 atomic_inc(&sk->sk_drops);
591 UDP6_INC_STATS_BH(sock_net(sk),
592 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
593 UDP6_INC_STATS_BH(sock_net(sk),
594 UDP_MIB_INERRORS, IS_UDPLITE(sk));
595 }
596 }
597 }
598 /*
599 * Note: called only from the BH handler context,
600 * so we don't need to lock the hashes.
601 */
602 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
603 struct in6_addr *saddr, struct in6_addr *daddr,
604 struct udp_table *udptable)
605 {
606 struct sock *sk, *stack[256 / sizeof(struct sock *)];
607 const struct udphdr *uh = udp_hdr(skb);
608 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
609 int dif;
610 unsigned int i, count = 0;
611
612 spin_lock(&hslot->lock);
613 sk = sk_nulls_head(&hslot->head);
614 dif = inet6_iif(skb);
615 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
616 while (sk) {
617 stack[count++] = sk;
618 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
619 uh->source, saddr, dif);
620 if (unlikely(count == ARRAY_SIZE(stack))) {
621 if (!sk)
622 break;
623 flush_stack(stack, count, skb, ~0);
624 count = 0;
625 }
626 }
627 /*
628 * before releasing the lock, we must take reference on sockets
629 */
630 for (i = 0; i < count; i++)
631 sock_hold(stack[i]);
632
633 spin_unlock(&hslot->lock);
634
635 if (count) {
636 flush_stack(stack, count, skb, count - 1);
637
638 for (i = 0; i < count; i++)
639 sock_put(stack[i]);
640 } else {
641 kfree_skb(skb);
642 }
643 return 0;
644 }
645
646 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
647 int proto)
648 {
649 int err;
650
651 UDP_SKB_CB(skb)->partial_cov = 0;
652 UDP_SKB_CB(skb)->cscov = skb->len;
653
654 if (proto == IPPROTO_UDPLITE) {
655 err = udplite_checksum_init(skb, uh);
656 if (err)
657 return err;
658 }
659
660 if (uh->check == 0) {
661 /* RFC 2460 section 8.1 says that we SHOULD log
662 this error. Well, it is reasonable.
663 */
664 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
665 return 1;
666 }
667 if (skb->ip_summed == CHECKSUM_COMPLETE &&
668 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
669 skb->len, proto, skb->csum))
670 skb->ip_summed = CHECKSUM_UNNECESSARY;
671
672 if (!skb_csum_unnecessary(skb))
673 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
674 &ipv6_hdr(skb)->daddr,
675 skb->len, proto, 0));
676
677 return 0;
678 }
679
680 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
681 int proto)
682 {
683 struct net *net = dev_net(skb->dev);
684 struct sock *sk;
685 struct udphdr *uh;
686 struct in6_addr *saddr, *daddr;
687 u32 ulen = 0;
688
689 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
690 goto short_packet;
691
692 saddr = &ipv6_hdr(skb)->saddr;
693 daddr = &ipv6_hdr(skb)->daddr;
694 uh = udp_hdr(skb);
695
696 ulen = ntohs(uh->len);
697 if (ulen > skb->len)
698 goto short_packet;
699
700 if (proto == IPPROTO_UDP) {
701 /* UDP validates ulen. */
702
703 /* Check for jumbo payload */
704 if (ulen == 0)
705 ulen = skb->len;
706
707 if (ulen < sizeof(*uh))
708 goto short_packet;
709
710 if (ulen < skb->len) {
711 if (pskb_trim_rcsum(skb, ulen))
712 goto short_packet;
713 saddr = &ipv6_hdr(skb)->saddr;
714 daddr = &ipv6_hdr(skb)->daddr;
715 uh = udp_hdr(skb);
716 }
717 }
718
719 if (udp6_csum_init(skb, uh, proto))
720 goto discard;
721
722 /*
723 * Multicast receive code
724 */
725 if (ipv6_addr_is_multicast(daddr))
726 return __udp6_lib_mcast_deliver(net, skb,
727 saddr, daddr, udptable);
728
729 /* Unicast */
730
731 /*
732 * check socket cache ... must talk to Alan about his plans
733 * for sock caches... i'll skip this for now.
734 */
735 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
736
737 if (sk == NULL) {
738 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
739 goto discard;
740
741 if (udp_lib_checksum_complete(skb))
742 goto discard;
743 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
744 proto == IPPROTO_UDPLITE);
745
746 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
747
748 kfree_skb(skb);
749 return 0;
750 }
751
752 /* deliver */
753
754 bh_lock_sock(sk);
755 if (!sock_owned_by_user(sk))
756 udpv6_queue_rcv_skb(sk, skb);
757 else
758 sk_add_backlog(sk, skb);
759 bh_unlock_sock(sk);
760 sock_put(sk);
761 return 0;
762
763 short_packet:
764 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
765 proto == IPPROTO_UDPLITE ? "-Lite" : "",
766 ulen, skb->len);
767
768 discard:
769 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
770 kfree_skb(skb);
771 return 0;
772 }
773
774 static __inline__ int udpv6_rcv(struct sk_buff *skb)
775 {
776 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
777 }
778
779 /*
780 * Throw away all pending data and cancel the corking. Socket is locked.
781 */
782 static void udp_v6_flush_pending_frames(struct sock *sk)
783 {
784 struct udp_sock *up = udp_sk(sk);
785
786 if (up->pending == AF_INET)
787 udp_flush_pending_frames(sk);
788 else if (up->pending) {
789 up->len = 0;
790 up->pending = 0;
791 ip6_flush_pending_frames(sk);
792 }
793 }
794
795 /**
796 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
797 * @sk: socket we are sending on
798 * @skb: sk_buff containing the filled-in UDP header
799 * (checksum field must be zeroed out)
800 */
801 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
802 const struct in6_addr *saddr,
803 const struct in6_addr *daddr, int len)
804 {
805 unsigned int offset;
806 struct udphdr *uh = udp_hdr(skb);
807 __wsum csum = 0;
808
809 if (skb_queue_len(&sk->sk_write_queue) == 1) {
810 /* Only one fragment on the socket. */
811 skb->csum_start = skb_transport_header(skb) - skb->head;
812 skb->csum_offset = offsetof(struct udphdr, check);
813 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
814 } else {
815 /*
816 * HW-checksum won't work as there are two or more
817 * fragments on the socket so that all csums of sk_buffs
818 * should be together
819 */
820 offset = skb_transport_offset(skb);
821 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
822
823 skb->ip_summed = CHECKSUM_NONE;
824
825 skb_queue_walk(&sk->sk_write_queue, skb) {
826 csum = csum_add(csum, skb->csum);
827 }
828
829 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
830 csum);
831 if (uh->check == 0)
832 uh->check = CSUM_MANGLED_0;
833 }
834 }
835
836 /*
837 * Sending
838 */
839
840 static int udp_v6_push_pending_frames(struct sock *sk)
841 {
842 struct sk_buff *skb;
843 struct udphdr *uh;
844 struct udp_sock *up = udp_sk(sk);
845 struct inet_sock *inet = inet_sk(sk);
846 struct flowi *fl = &inet->cork.fl;
847 int err = 0;
848 int is_udplite = IS_UDPLITE(sk);
849 __wsum csum = 0;
850
851 /* Grab the skbuff where UDP header space exists. */
852 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
853 goto out;
854
855 /*
856 * Create a UDP header
857 */
858 uh = udp_hdr(skb);
859 uh->source = fl->fl_ip_sport;
860 uh->dest = fl->fl_ip_dport;
861 uh->len = htons(up->len);
862 uh->check = 0;
863
864 if (is_udplite)
865 csum = udplite_csum_outgoing(sk, skb);
866 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
867 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
868 up->len);
869 goto send;
870 } else
871 csum = udp_csum_outgoing(sk, skb);
872
873 /* add protocol-dependent pseudo-header */
874 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
875 up->len, fl->proto, csum );
876 if (uh->check == 0)
877 uh->check = CSUM_MANGLED_0;
878
879 send:
880 err = ip6_push_pending_frames(sk);
881 if (err) {
882 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
883 UDP6_INC_STATS_USER(sock_net(sk),
884 UDP_MIB_SNDBUFERRORS, is_udplite);
885 err = 0;
886 }
887 } else
888 UDP6_INC_STATS_USER(sock_net(sk),
889 UDP_MIB_OUTDATAGRAMS, is_udplite);
890 out:
891 up->len = 0;
892 up->pending = 0;
893 return err;
894 }
895
896 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
897 struct msghdr *msg, size_t len)
898 {
899 struct ipv6_txoptions opt_space;
900 struct udp_sock *up = udp_sk(sk);
901 struct inet_sock *inet = inet_sk(sk);
902 struct ipv6_pinfo *np = inet6_sk(sk);
903 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
904 struct in6_addr *daddr, *final_p = NULL, final;
905 struct ipv6_txoptions *opt = NULL;
906 struct ip6_flowlabel *flowlabel = NULL;
907 struct flowi fl;
908 struct dst_entry *dst;
909 int addr_len = msg->msg_namelen;
910 int ulen = len;
911 int hlimit = -1;
912 int tclass = -1;
913 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
914 int err;
915 int connected = 0;
916 int is_udplite = IS_UDPLITE(sk);
917 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
918
919 /* destination address check */
920 if (sin6) {
921 if (addr_len < offsetof(struct sockaddr, sa_data))
922 return -EINVAL;
923
924 switch (sin6->sin6_family) {
925 case AF_INET6:
926 if (addr_len < SIN6_LEN_RFC2133)
927 return -EINVAL;
928 daddr = &sin6->sin6_addr;
929 break;
930 case AF_INET:
931 goto do_udp_sendmsg;
932 case AF_UNSPEC:
933 msg->msg_name = sin6 = NULL;
934 msg->msg_namelen = addr_len = 0;
935 daddr = NULL;
936 break;
937 default:
938 return -EINVAL;
939 }
940 } else if (!up->pending) {
941 if (sk->sk_state != TCP_ESTABLISHED)
942 return -EDESTADDRREQ;
943 daddr = &np->daddr;
944 } else
945 daddr = NULL;
946
947 if (daddr) {
948 if (ipv6_addr_v4mapped(daddr)) {
949 struct sockaddr_in sin;
950 sin.sin_family = AF_INET;
951 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
952 sin.sin_addr.s_addr = daddr->s6_addr32[3];
953 msg->msg_name = &sin;
954 msg->msg_namelen = sizeof(sin);
955 do_udp_sendmsg:
956 if (__ipv6_only_sock(sk))
957 return -ENETUNREACH;
958 return udp_sendmsg(iocb, sk, msg, len);
959 }
960 }
961
962 if (up->pending == AF_INET)
963 return udp_sendmsg(iocb, sk, msg, len);
964
965 /* Rough check on arithmetic overflow,
966 better check is made in ip6_append_data().
967 */
968 if (len > INT_MAX - sizeof(struct udphdr))
969 return -EMSGSIZE;
970
971 if (up->pending) {
972 /*
973 * There are pending frames.
974 * The socket lock must be held while it's corked.
975 */
976 lock_sock(sk);
977 if (likely(up->pending)) {
978 if (unlikely(up->pending != AF_INET6)) {
979 release_sock(sk);
980 return -EAFNOSUPPORT;
981 }
982 dst = NULL;
983 goto do_append_data;
984 }
985 release_sock(sk);
986 }
987 ulen += sizeof(struct udphdr);
988
989 memset(&fl, 0, sizeof(fl));
990
991 if (sin6) {
992 if (sin6->sin6_port == 0)
993 return -EINVAL;
994
995 fl.fl_ip_dport = sin6->sin6_port;
996 daddr = &sin6->sin6_addr;
997
998 if (np->sndflow) {
999 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1000 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
1001 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1002 if (flowlabel == NULL)
1003 return -EINVAL;
1004 daddr = &flowlabel->dst;
1005 }
1006 }
1007
1008 /*
1009 * Otherwise it will be difficult to maintain
1010 * sk->sk_dst_cache.
1011 */
1012 if (sk->sk_state == TCP_ESTABLISHED &&
1013 ipv6_addr_equal(daddr, &np->daddr))
1014 daddr = &np->daddr;
1015
1016 if (addr_len >= sizeof(struct sockaddr_in6) &&
1017 sin6->sin6_scope_id &&
1018 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1019 fl.oif = sin6->sin6_scope_id;
1020 } else {
1021 if (sk->sk_state != TCP_ESTABLISHED)
1022 return -EDESTADDRREQ;
1023
1024 fl.fl_ip_dport = inet->inet_dport;
1025 daddr = &np->daddr;
1026 fl.fl6_flowlabel = np->flow_label;
1027 connected = 1;
1028 }
1029
1030 if (!fl.oif)
1031 fl.oif = sk->sk_bound_dev_if;
1032
1033 if (!fl.oif)
1034 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
1035
1036 fl.mark = sk->sk_mark;
1037
1038 if (msg->msg_controllen) {
1039 opt = &opt_space;
1040 memset(opt, 0, sizeof(struct ipv6_txoptions));
1041 opt->tot_len = sizeof(*opt);
1042
1043 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
1044 if (err < 0) {
1045 fl6_sock_release(flowlabel);
1046 return err;
1047 }
1048 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1049 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1050 if (flowlabel == NULL)
1051 return -EINVAL;
1052 }
1053 if (!(opt->opt_nflen|opt->opt_flen))
1054 opt = NULL;
1055 connected = 0;
1056 }
1057 if (opt == NULL)
1058 opt = np->opt;
1059 if (flowlabel)
1060 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1061 opt = ipv6_fixup_options(&opt_space, opt);
1062
1063 fl.proto = sk->sk_protocol;
1064 if (!ipv6_addr_any(daddr))
1065 ipv6_addr_copy(&fl.fl6_dst, daddr);
1066 else
1067 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1068 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
1069 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
1070 fl.fl_ip_sport = inet->inet_sport;
1071
1072 /* merge ip6_build_xmit from ip6_output */
1073 if (opt && opt->srcrt) {
1074 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1075 ipv6_addr_copy(&final, &fl.fl6_dst);
1076 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1077 final_p = &final;
1078 connected = 0;
1079 }
1080
1081 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
1082 fl.oif = np->mcast_oif;
1083 connected = 0;
1084 }
1085
1086 security_sk_classify_flow(sk, &fl);
1087
1088 err = ip6_sk_dst_lookup(sk, &dst, &fl);
1089 if (err)
1090 goto out;
1091 if (final_p)
1092 ipv6_addr_copy(&fl.fl6_dst, final_p);
1093
1094 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1095 if (err < 0) {
1096 if (err == -EREMOTE)
1097 err = ip6_dst_blackhole(sk, &dst, &fl);
1098 if (err < 0)
1099 goto out;
1100 }
1101
1102 if (hlimit < 0) {
1103 if (ipv6_addr_is_multicast(&fl.fl6_dst))
1104 hlimit = np->mcast_hops;
1105 else
1106 hlimit = np->hop_limit;
1107 if (hlimit < 0)
1108 hlimit = ip6_dst_hoplimit(dst);
1109 }
1110
1111 if (tclass < 0)
1112 tclass = np->tclass;
1113
1114 if (msg->msg_flags&MSG_CONFIRM)
1115 goto do_confirm;
1116 back_from_confirm:
1117
1118 lock_sock(sk);
1119 if (unlikely(up->pending)) {
1120 /* The socket is already corked while preparing it. */
1121 /* ... which is an evident application bug. --ANK */
1122 release_sock(sk);
1123
1124 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1125 err = -EINVAL;
1126 goto out;
1127 }
1128
1129 up->pending = AF_INET6;
1130
1131 do_append_data:
1132 up->len += ulen;
1133 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1134 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1135 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
1136 (struct rt6_info*)dst,
1137 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1138 if (err)
1139 udp_v6_flush_pending_frames(sk);
1140 else if (!corkreq)
1141 err = udp_v6_push_pending_frames(sk);
1142 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1143 up->pending = 0;
1144
1145 if (dst) {
1146 if (connected) {
1147 ip6_dst_store(sk, dst,
1148 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
1149 &np->daddr : NULL,
1150 #ifdef CONFIG_IPV6_SUBTREES
1151 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
1152 &np->saddr :
1153 #endif
1154 NULL);
1155 } else {
1156 dst_release(dst);
1157 }
1158 dst = NULL;
1159 }
1160
1161 if (err > 0)
1162 err = np->recverr ? net_xmit_errno(err) : 0;
1163 release_sock(sk);
1164 out:
1165 dst_release(dst);
1166 fl6_sock_release(flowlabel);
1167 if (!err)
1168 return len;
1169 /*
1170 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1171 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1172 * we don't have a good statistic (IpOutDiscards but it can be too many
1173 * things). We could add another new stat but at least for now that
1174 * seems like overkill.
1175 */
1176 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1177 UDP6_INC_STATS_USER(sock_net(sk),
1178 UDP_MIB_SNDBUFERRORS, is_udplite);
1179 }
1180 return err;
1181
1182 do_confirm:
1183 dst_confirm(dst);
1184 if (!(msg->msg_flags&MSG_PROBE) || len)
1185 goto back_from_confirm;
1186 err = 0;
1187 goto out;
1188 }
1189
1190 void udpv6_destroy_sock(struct sock *sk)
1191 {
1192 lock_sock(sk);
1193 udp_v6_flush_pending_frames(sk);
1194 release_sock(sk);
1195
1196 inet6_destroy_sock(sk);
1197 }
1198
1199 /*
1200 * Socket option code for UDP
1201 */
1202 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1203 char __user *optval, unsigned int optlen)
1204 {
1205 if (level == SOL_UDP || level == SOL_UDPLITE)
1206 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1207 udp_v6_push_pending_frames);
1208 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1209 }
1210
1211 #ifdef CONFIG_COMPAT
1212 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1213 char __user *optval, unsigned int optlen)
1214 {
1215 if (level == SOL_UDP || level == SOL_UDPLITE)
1216 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1217 udp_v6_push_pending_frames);
1218 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1219 }
1220 #endif
1221
1222 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1223 char __user *optval, int __user *optlen)
1224 {
1225 if (level == SOL_UDP || level == SOL_UDPLITE)
1226 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1227 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1228 }
1229
1230 #ifdef CONFIG_COMPAT
1231 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1232 char __user *optval, int __user *optlen)
1233 {
1234 if (level == SOL_UDP || level == SOL_UDPLITE)
1235 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1236 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1237 }
1238 #endif
1239
1240 static int udp6_ufo_send_check(struct sk_buff *skb)
1241 {
1242 struct ipv6hdr *ipv6h;
1243 struct udphdr *uh;
1244
1245 if (!pskb_may_pull(skb, sizeof(*uh)))
1246 return -EINVAL;
1247
1248 ipv6h = ipv6_hdr(skb);
1249 uh = udp_hdr(skb);
1250
1251 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1252 IPPROTO_UDP, 0);
1253 skb->csum_start = skb_transport_header(skb) - skb->head;
1254 skb->csum_offset = offsetof(struct udphdr, check);
1255 skb->ip_summed = CHECKSUM_PARTIAL;
1256 return 0;
1257 }
1258
1259 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1260 {
1261 struct sk_buff *segs = ERR_PTR(-EINVAL);
1262 unsigned int mss;
1263 unsigned int unfrag_ip6hlen, unfrag_len;
1264 struct frag_hdr *fptr;
1265 u8 *mac_start, *prevhdr;
1266 u8 nexthdr;
1267 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1268 int offset;
1269 __wsum csum;
1270
1271 mss = skb_shinfo(skb)->gso_size;
1272 if (unlikely(skb->len <= mss))
1273 goto out;
1274
1275 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1276 /* Packet is from an untrusted source, reset gso_segs. */
1277 int type = skb_shinfo(skb)->gso_type;
1278
1279 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1280 !(type & (SKB_GSO_UDP))))
1281 goto out;
1282
1283 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1284
1285 segs = NULL;
1286 goto out;
1287 }
1288
1289 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1290 * do checksum of UDP packets sent as multiple IP fragments.
1291 */
1292 offset = skb->csum_start - skb_headroom(skb);
1293 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1294 offset += skb->csum_offset;
1295 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1296 skb->ip_summed = CHECKSUM_NONE;
1297
1298 /* Check if there is enough headroom to insert fragment header. */
1299 if ((skb_headroom(skb) < frag_hdr_sz) &&
1300 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1301 goto out;
1302
1303 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1304 * bytes to insert fragment header.
1305 */
1306 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1307 nexthdr = *prevhdr;
1308 *prevhdr = NEXTHDR_FRAGMENT;
1309 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1310 unfrag_ip6hlen;
1311 mac_start = skb_mac_header(skb);
1312 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1313
1314 skb->mac_header -= frag_hdr_sz;
1315 skb->network_header -= frag_hdr_sz;
1316
1317 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1318 fptr->nexthdr = nexthdr;
1319 fptr->reserved = 0;
1320 ipv6_select_ident(fptr);
1321
1322 /* Fragment the skb. ipv6 header and the remaining fields of the
1323 * fragment header are updated in ipv6_gso_segment()
1324 */
1325 segs = skb_segment(skb, features);
1326
1327 out:
1328 return segs;
1329 }
1330
1331 static const struct inet6_protocol udpv6_protocol = {
1332 .handler = udpv6_rcv,
1333 .err_handler = udpv6_err,
1334 .gso_send_check = udp6_ufo_send_check,
1335 .gso_segment = udp6_ufo_fragment,
1336 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1337 };
1338
1339 /* ------------------------------------------------------------------------ */
1340 #ifdef CONFIG_PROC_FS
1341
1342 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1343 {
1344 struct inet_sock *inet = inet_sk(sp);
1345 struct ipv6_pinfo *np = inet6_sk(sp);
1346 struct in6_addr *dest, *src;
1347 __u16 destp, srcp;
1348
1349 dest = &np->daddr;
1350 src = &np->rcv_saddr;
1351 destp = ntohs(inet->inet_dport);
1352 srcp = ntohs(inet->inet_sport);
1353 seq_printf(seq,
1354 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1355 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1356 bucket,
1357 src->s6_addr32[0], src->s6_addr32[1],
1358 src->s6_addr32[2], src->s6_addr32[3], srcp,
1359 dest->s6_addr32[0], dest->s6_addr32[1],
1360 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1361 sp->sk_state,
1362 sk_wmem_alloc_get(sp),
1363 sk_rmem_alloc_get(sp),
1364 0, 0L, 0,
1365 sock_i_uid(sp), 0,
1366 sock_i_ino(sp),
1367 atomic_read(&sp->sk_refcnt), sp,
1368 atomic_read(&sp->sk_drops));
1369 }
1370
1371 int udp6_seq_show(struct seq_file *seq, void *v)
1372 {
1373 if (v == SEQ_START_TOKEN)
1374 seq_printf(seq,
1375 " sl "
1376 "local_address "
1377 "remote_address "
1378 "st tx_queue rx_queue tr tm->when retrnsmt"
1379 " uid timeout inode ref pointer drops\n");
1380 else
1381 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1382 return 0;
1383 }
1384
1385 static struct udp_seq_afinfo udp6_seq_afinfo = {
1386 .name = "udp6",
1387 .family = AF_INET6,
1388 .udp_table = &udp_table,
1389 .seq_fops = {
1390 .owner = THIS_MODULE,
1391 },
1392 .seq_ops = {
1393 .show = udp6_seq_show,
1394 },
1395 };
1396
1397 int __net_init udp6_proc_init(struct net *net)
1398 {
1399 return udp_proc_register(net, &udp6_seq_afinfo);
1400 }
1401
1402 void udp6_proc_exit(struct net *net) {
1403 udp_proc_unregister(net, &udp6_seq_afinfo);
1404 }
1405 #endif /* CONFIG_PROC_FS */
1406
1407 /* ------------------------------------------------------------------------ */
1408
1409 struct proto udpv6_prot = {
1410 .name = "UDPv6",
1411 .owner = THIS_MODULE,
1412 .close = udp_lib_close,
1413 .connect = ip6_datagram_connect,
1414 .disconnect = udp_disconnect,
1415 .ioctl = udp_ioctl,
1416 .destroy = udpv6_destroy_sock,
1417 .setsockopt = udpv6_setsockopt,
1418 .getsockopt = udpv6_getsockopt,
1419 .sendmsg = udpv6_sendmsg,
1420 .recvmsg = udpv6_recvmsg,
1421 .backlog_rcv = udpv6_queue_rcv_skb,
1422 .hash = udp_lib_hash,
1423 .unhash = udp_lib_unhash,
1424 .get_port = udp_v6_get_port,
1425 .memory_allocated = &udp_memory_allocated,
1426 .sysctl_mem = sysctl_udp_mem,
1427 .sysctl_wmem = &sysctl_udp_wmem_min,
1428 .sysctl_rmem = &sysctl_udp_rmem_min,
1429 .obj_size = sizeof(struct udp6_sock),
1430 .slab_flags = SLAB_DESTROY_BY_RCU,
1431 .h.udp_table = &udp_table,
1432 #ifdef CONFIG_COMPAT
1433 .compat_setsockopt = compat_udpv6_setsockopt,
1434 .compat_getsockopt = compat_udpv6_getsockopt,
1435 #endif
1436 };
1437
1438 static struct inet_protosw udpv6_protosw = {
1439 .type = SOCK_DGRAM,
1440 .protocol = IPPROTO_UDP,
1441 .prot = &udpv6_prot,
1442 .ops = &inet6_dgram_ops,
1443 .no_check = UDP_CSUM_DEFAULT,
1444 .flags = INET_PROTOSW_PERMANENT,
1445 };
1446
1447
1448 int __init udpv6_init(void)
1449 {
1450 int ret;
1451
1452 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1453 if (ret)
1454 goto out;
1455
1456 ret = inet6_register_protosw(&udpv6_protosw);
1457 if (ret)
1458 goto out_udpv6_protocol;
1459 out:
1460 return ret;
1461
1462 out_udpv6_protocol:
1463 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1464 goto out;
1465 }
1466
1467 void udpv6_exit(void)
1468 {
1469 inet6_unregister_protosw(&udpv6_protosw);
1470 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1471 }
kernel source for telekom puls (alcatel/mediatek)